<template>
    <div class="nav-bar" :class="{'is_fixed':ifFixed}">
        <div class="container">
            <div class="pro-title">
                {{title}}
            </div>
            <div class="pro-param">
                <a href="javascript:;">概述</a><span>|</span>
                <a href="javascript:;">参数</a><span>|</span>
                <a href="javascript:;">评价</a>
                <slot name="buy"></slot>
            </div>
        </div>
    </div>
</template>
<script>
export default {
    name:'nav-bar',
    props: {
        title: String
    },
    data() {
        return {
            ifFixed: false
        }
    },
    mounted() {
        window.addEventListener('scroll',this.initHeight)
    },
    methods: {
        initHeight () {
            let scrollTop = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop
            this.ifFixed = scrollTop > 152 ? true : false
        }
    },
    destroyed () {
        window.removeEventListener('scroll',this.initHeight, false)
    }
}
</script>
<style lang="scss" scoped>
@import './../assets/scss/config.scss';
@import './../assets/scss/mixin.scss';
    .nav-bar{
        height: 70px;
        line-height: 70px;
        border-top: 1px solid $colorH;
        background-color: $colorG;
        z-index: 10;
        &.is_fixed{
            position: fixed;
            top: 0;
            width: 100%;
            box-shadow: 0 5px 5px $colorE;
        }
        .container{
            @include flex();
            .pro-title{
                font-size: $fontH;
                color: $colorB;
                font-weight: bold;
            }
            .pro-param{
                font-size: $fontJ;
                span{
                    margin: 0 10px;
                }
                a{
                    color: $colorC;
                }
            }
        }
    }
</style>